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PHP CVEs

Vulnerabilities in the PHP language itself, and which PHP versions they affect.

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CVE-2021-21705

MEDIUM 5.3 CVSS 3.1
Published
October 4, 2021
Last modified
June 17, 2026
NVD status
Modified
Reported by
security@php.net
Weakness
CWE-20
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Description

In PHP versions 7.3.x below 7.3.29, 7.4.x below 7.4.21 and 8.0.x below 8.0.8, when using URL validation functionality via filter_var() function with FILTER_VALIDATE_URL parameter, an URL with invalid password field can be accepted as valid. This can lead to the code incorrectly parsing the URL and potentially leading to other security implications - like contacting a wrong server or making a wrong access decision.

Affected products and versions

  • PHP — From 7.3.0 (including) to 7.3.29 (excluding)
  • PHP — From 7.4.0 (including) to 7.4.21 (excluding)
  • PHP — From 8.0.0 (including) to 8.0.8 (excluding)

References

  • bugs.php.net https://bugs.php.net/bug.php?id=81122 Exploit, Issue Tracking, Patch, Vendor Advisory
  • security.gentoo.org https://security.gentoo.org/glsa/202209-20 Third Party Advisory
  • security.netapp.com https://security.netapp.com/advisory/ntap-20211029-0006/ Third Party Advisory
  • www.oracle.com https://www.oracle.com/security-alerts/cpujan2022.html Patch, Vendor Advisory
  • nvd.nist.gov Official NVD record